The hydraulic station of a mine hoist is a core supporting equipment to ensure the safe operation of the hoisting system, and its performance directly determines the reliability and controllability of the braking process. Taking the TE160B hydraulic station as an example, the system adopts a dual-pump, dual-pressure-regulating redundant design, integrating a variable displacement piston pump, cartridge valve group, electro-hydraulic proportional control and sensor monitoring unit, and has high stability and fault self-adaptation capability.
Working braking principle
1. Pressure source supply
The system is equipped with two independent oil pump units (one main and one standby), using variable displacement piston pumps as the power source. The output flow rate can be automatically adjusted according to the load, reducing energy consumption and system heat generation. The pressurized oil enters the main valve assembly after being purified by an oil filter, ensuring that the oil cleanliness meets the servo control requirements.
2. Electro-hydraulic proportional pressure regulation control
The core of the working brake lies in the stepless pressure regulation achieved through an electro-hydraulic proportional relief valve. The driver operates a lever to change the output voltage signal, driving the proportional electromagnet to continuously adjust the opening of the relief valve, thereby precisely controlling the system hydraulic pressure. When the voltage increases, the hydraulic pressure rises, pushing the disc brake to release; when the voltage decreases, the braking force gradually builds up, achieving smooth deceleration.
3. Residual pressure and braking status
When the control voltage returns to zero, the system maintains a minimum residual voltage (typically ≤0.5MPa). At this point, the brake is fully engaged under the force of the disc spring, achieving full braking. Excessive residual voltage will affect the braking response speed, while insufficient residual voltage may lead to delayed brake release; both must be strictly controlled within the standard range.
Safety braking mechanism
1. Two-stage braking protection
In the event of a sudden malfunction or emergency stop, the system triggers the safety brake. Electromagnets G3, G4, and G7 are de-energized, the hydraulic pressure of the fixed drum brake quickly returns to zero, and the first level of braking force is applied; the hydraulic pressure of the floating drum drops to the preset P1 level, and after a delay of t1 seconds, G5 is de-energized and G6 is energized via a time relay to achieve full braking.
2. Accumulator voltage stabilization and compensation
During the delay, the accumulator replenishes oil to the system to maintain stable P1 level pressure, ensuring that the deceleration is within a safe range and avoiding equipment damage or wire rope slippage caused by impact loads.
System reliability enhancement measures
Dual pump redundancy and valve group redundancy design enhance fault tolerance;
It is equipped with a pressure transmitter, temperature sensor and oil filter circuit to realize real-time monitoring of the operating status; it adopts a cartridge valve integrated structure to reduce leakage points and improve system response speed and sealing reliability.
Keywords
Mine Hoist Hydraulic Station
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